Ink jet recording sheet and method for producing the same

Abstract

The object of the present invention is to provide ink jet recording sheets having a high color forming property and causing no troubles in carrying them in printers. In ink jet recording sheets having at least one ink receiving layer and a gloss developing layer coated by a cast coating method laminated in succession on one side of a support and a back-coat layer comprising a pigment and a binder on another side of the support, the static friction coefficient between the gloss developing layer and the back-coat layer is adjusted to 0.9 or lower under the conditions of 20° C. and 65%RH. Furthermore, the object can be attained by using an alumina hydrate as the pigment in the gloss developing layer and a specific pigment and a lubricant in the back-coat layer.

What is claimed is:  
     
       1. An ink jet recording sheet comprising: 
       a support;  
       at least one ink receiving layer and a gloss developing layer laminated in succession on one side of the support; and  
       a back-coat layer comprising a pigment and binder provided on the other side of the support,  
       wherein a static friction coefficient between the gloss developing layer and the back-coat layer is 0.9 or lower under the conditions of 20° C. and 65%RH, and  
       the amount of binder in the back-coat layer is 5-70 parts by weight based on 100 parts by weight of the pigment in the back-coat layer.  
     
     
       2. An inkjet recording sheet according to  claim 1 , wherein the gloss developing layer comprises an alumina hydrate. 
     
     
       3. An ink jet recording sheet according to  claim 1  or  2 , wherein the pigment used in the back-coat layer is at least one pigment selected from the group consisting of kaolin, talc, calcium carbonate and synthetic amorphous silica. 
     
     
       4. An ink jet recording sheet according to  claim 1 , wherein the back-coat layer contains a lubricant. 
     
     
       5. An ink jet recording sheet according to  claim 1 , wherein the gloss developing layer comprises colloidal silica. 
     
     
       6. An ink jet recording sheet according to  claim 5 , wherein the pigment used in the back-coat layer is at least one pigment selected from the group consisting of kaolin, talc, calcium carbonate and synthetic amorphous silica. 
     
     
       7. An ink jet recording sheet according to  claim 6 , wherein the back-coat layer contains a lubricant. 
     
     
       8. An inkjet recording sheet according to  claim 1 , wherein the pigment used in the ink receiving layer is a porous inorganic pigment. 
     
     
       9. An ink jet recording sheet according to  claim 8 , wherein the porous inorganic pigment is porous synthetic amorphous silica or porous alumina.